Fix spelling mistakes, whitespace error, and broken "Methods" links

[cbm755]

Description

I saw a couple things by hand and then ran codespell.

Type of change

• Refactoring (made code better without changing its behaviour)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How this has been tested

pre-commit ran successfully. I was not yet able to actually look at the docs (#194).

No new automated tests required.

Checklist

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Reviewer Checklist

• I have reviewed the PR and ensured no secret values are present